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Although still a newer technique by road builder standards, the full-depth reclamation (FDR) technique for rehabilitating asphalt and chip-and-seal roads is being embraced across the country. Road officials have found this practice of pulverizing an asphalt surface and blending it with the underlying base delivers a long list of quality and cost advantages.
The process is performed entirely at the job site so the costs of removing, loading, hauling, crushing, and sizing of the old pavement material are eliminated. Because the old pavement is recycled, the need for disposal is eliminated. Additionally, fewer workers and less equipment are required, resulting in lower costs and better traffic flow. The base material costs are also minimized or eliminated during this process and natural resources are conserved since all existing materials are reused.
The structural integrity of the road base is increased to protect the overlay, thereby adding years to road life and improving ride quality, and total pavement thickness can be reduced, resulting in lower overlay material costs.
Not only does the FDR technique produce a superior base for a new overlay, it dramatically reduces the time and cost of construction compared with traditional methods. Some studies suggest savings as high as 50% over other methods of reconstruction while achieving the same, or better, finished road quality and durability levels.
The secret to many successful FDR projects is the addition of LIQUIDOW (liquid calcium chloride) as a base stabilization agent.
For more than 75 years, dust control/surface stabilization programs with LIQUIDOW* liquid calcium chloride have been turning citizen complaints into “thank you” calls…and saving townships big chunks of their road maintenance budgets.
A program with LIQUIDOW provides cleaner, safer, and more comfortable driving conditions for residents who live on and travel unpaved roads. It also reduces maintenance costs, typically by 30% or more. Here’s how.
Calcium chloride is an incredibly thirsty material that constantly attracts moisture, then fiercely resists evaporation. That’s why it controls dust for months at a time, even in the hottest, driest conditions. And that’s the most obvious benefit seen by your constituents. Their cars and homes are cleaner. Driver visibility is maintained.
Yet, dust control is just the beginning of calcium chloride’s contribution to road quality and cost savings. That’s because those dust particles are critically important to road quality. They help keep larger aggregates from being kicked off the road. Untreated roads with moderate traffic will typically lose 300 tons of aggregate per mile per year. And, as aggregate is lost, roads quickly deteriorate. Rutting, washboarding, and potholes soon follow. Paint chips and cracked windshields are common. People are unhappy and the costs to renovate and maintain the road are high.
With LIQUIDOW, aggregate losses are typically reduced 75-80%. And the longer a program of calcium chloride treatment continues, the better an unpaved road becomes…and the less attention it requires.
The Dow Chemical Company has recently published a comprehensive manual on the use of LIQUIDOW* calcium chloride for prewetting salt for anti-icing and deicing, and when used alone for liquid anti-icing.
As you know, dozens of local governments at every level have adopted the use of wetted salt for deicing. They’ve documented the superior performance that translates into faster and higher quality service, lower chemical usage, and greatly reduced snowfighting costs.
This manual provides all the details on this widely popular technique, including the specifics on the three application options.
More recently, the FHWA and dozens of states have successfully tested the idea of anti-icing; spreading wetted salt or straight liquid calcium chloride on pavements before snowfalls to prevent bonding. In cases of light snow, these pretreatments prevent hazardous conditions as all snow melts on contact. In cases where snow persists, the pretreatment makes it far easier to reach bare pavement conditions.
In all cases there is the potential to significantly reduce the resources required to maintain safe travel in winter, while at the same time increasing the level of service to the motoring public. Anti-icing is proving to be “the ounce of prevention that’s worth a pound of cure.” Dow’s new manual provides detailed information on this newest snowfighting technique as well.
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